Day 76 - CS Quizizz

Does a Subclass need to have a constructor?

• No, it can inherit the constructor from the Superclass.

• Yes, it must always have an explicit constructor to take the parameteres of the superclass.

• No, subclasses objects are part of the superclass object, so the superclass constructor is called.

• Yes, the subclass has its own constructor, either explicit or implicitly created.

How does a Subclass call the Superclass constructor?

• Using the super keyword in a separate method within the subclass

• Using the Superclass name in a separate method within the subclass

• Using the super keyword in the first line of the subclass constructor.

• Using the Superclass name in the first line of the subclass constructor.

If a superclass constructor exists and a subclass doesn’t explicitly call the that constructor, what happens?

• Java implicitly calls the no-argument superclass constructor

• Java doesn’t create a superclass object

• The program will not compile and will generate an error.

• Java initializes all superclass variables with default values.

If a class does not extend any class, what happens?

• Nothing. Not every class needs to have a superclass.

• The program will not compile and will throw an error.

• The class with the main method becomes the superclass.

• By default, we extend the Object class

True or False: A subclass can be extended by another class to become a superclass.

• True

• False